Brake cooling system



April 25, 1933. 1 p TARBOX 1,905,657

BRKE COOLING SYSTEM Filed Jan. 22, 1929 nwn INVENTOR.

A TToRNE y.

CII

Patented pr. 25, 19.33

UNITED STATES PATENT OFFICE JOHN P. TARBOX, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO B'UDD WHEEL COM- PANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION F PENNSYLVANIA 'BRAKE cooLING SYSTEM Application led January 22, 1929. Serial No. 334,238.

This invention relates to a braking system in which there is provided an organization of parts directed especially to an elficient cooling of @the braking surfaces at all times by cooling currents of air. It has special reference to the braking systems of automobiles, particularly in busses.

In the operation of busses on certain routes where the stopping is frequent, or where the grades are very great and very frequent, or in sections of the country where the weather is very hot, particularly in large busses, the problem of keeping the brakes cool has been sometimes a serious one. Especially has this been so with vehicles having very large pneumatic tires and in which the diameter of the brake drum therefore approaches very closely the consequently c rected to the relief of this difficulty, many of them through air circulation. My invention means to remove the difficulties set forth by air circulation, but through a structure so organized that iLis at once practically and economically built; involving aI very minimum of alteration of standard brake structures, and insures a circulation of air, at very maximum cooling, no matter how the pressure for circulation is derived. More specifically stated, I solve the problem by supporting air current directing flanges from thekusual brake cover plate in such arrangement with respect to the brake drum and the brake shoes that air currents are circulated freely on both faces of both the shoe and the brake drum when the brake is off and continuously on the exterior surfaces of the engaging-portions of said parts while the brake is on.

In the accompanying drawing I show the form of r`my invention which is now best known tome. Of the drawing,

Fig. 1 is an axial cross section of an automobile wheel in which this system is embodied,

Fig. 2 is a side elevation of such a wheel.

As designated, 10 is the hub of the wheel,

11 the body of the wheel, in this case depicted as a disc, 12 is the rim, and 13, shown in dotted lines, the tire. The brake drum 14 is supported from the hub 10 separately from the disc and its braking surface 15 parallels the rim and it is of such diameter that it lies adjacent to the rim 12.

A brake shoe 16 is arranged internally of the drum to internally engage the braking surface 15. The brake mechanism is not exteriorly of the braking surface 15 and spaced therefrom into close adjacency to the disc 11. Preferably. I form this angc integrally with the cover 17, but a separate member ma be attached if desired. Interiorly of the b1 brake shoe 16 cover plate 17 supports a second Hange 21. This flange is preferably formed separably from the cover plate and welded thereto at a point 22. It extends in close adjacency to the inside of the brake shoe 16 and to the head of the brake drum 14, and is contiguous to the shoe when the brake is off. The relative arrangement of these parts is such that air'circulation channels are provided between all of them by means of which air entering or exiting either between rim 12 and flange 20 or between fiange 21 and brakedrum head 14, or from any point between anges 20 and 21, will be directed simultaneously betweenthe adjacent surfaces of the ange 20 and the breaking surface 15, of the braking surface 15 and the brake shoe 16, and ofthe exterior surface of the shoe 16 andthe interior surface raking surface 15 and the tion may be utilized such, for example, as`

of the iange 21. ne such circulation is, in spaced relation thereto, said interiorly indicated by the arrows.

An opening 23 is provided near the axis of the cover plate 17 t0 insure entrance or exit of air to the interior of drum 11 irrespective off the particular direction of the circulation. l Any known means of circulawind vanes, exhaust nozzles or the like, attached and located with respectto the entrance and the exit. In all of them external flanges are carried` by the cover platel' and constitute internal and external baffle plates -which insure the passage of air currents over each and every square inch of radiating surface internally and externally associated withvthe braking surface 15 and the brake Shoe 16. In addition, the baiile plate I20 constitutes an intervened heat shield between the braking surface 15 and the rim 12. Thus the brakes are not only most eiiiciently cooled at all times, but also what heat there remains is eiectually precluded by the baiiie plate 20 from reaching the rim 12. In fact, the air current between rim 12 v and the bale 20 takes heat directly from all contiguous surfaces of both the rim 12 and its associated parts and the baille plate itself. Any form of pressure or suction device may be applied to the conduit 24 to produce a circulation of air, for example, the exhaust gases of a car engine may be employed for such purposes.

Such is the nature of my invention. I desire to have it understood that in the annexed claims I intend to cover each and all modifications which protect its generic spirit.

What I claim as new and useful and desire to protect by Letters Patent is 1. In combination in a braking system, a wheel having a rim, a brake drum interiorly of the rim of the wheel, a brake drum cover plate, and annular transverse baffle flanges carried by the coverplate, one interiorly and one exteriorly of the drum and in spaced relation thereto.

2. vIn combination in a braking system, a wheel having a rim and a body, a brake jdrum interiorly of the rim having a head and transversely extending braking surface, a brake drum cover vplate and annular transverse bafiie ianges carried by the coverrplate, one exteriorly of the braking surface and projecting into proximity of the body of carried ange lying substantially contiguous to the inner perimeter of the brake shoe wheel having a rim, a brake drum surface within the rim, a brake shoe coactiiig with said surface, a brake cover late, and an annular baile flange carried y said cover plate interiorly of the braking shoe and lying substantially contiguous to the shoe when the brake is oi. Y'

In testimony whereof I hereunto affix my signature. l

JOHN P. TARBOX.

the wheel and the other interiorly of the I braking surface and projecting in proximity to the head of the brake drum.

3. In combination in a braking system, a wheel havinga rim, a brake drum interiorly of the rim, a brake shoe interiorly of the drum, and a brake drum cover plate and 'i annular transverse baiie flanges carried by the cover plate, the one exteriorly of the drum and the other interiorly thereof and 

